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Diurnal and Seasonal Characteristics of Aerosol Ionic Constituents over an Urban Location in Western India: Secondary Aerosol Formation and Meteorological Influence

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Volume: 14 | Issue: 6 | Pages: 1701-1713
DOI: 10.4209/aaqr.2013.09.0288
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A.K. Sudheer , Ramabadran Rengarajan, Dipjyoti Deka, Ravi Bhushan, Sunil Kumar Singh, Mohammed Yusuff Aslam

  • Geosciences Division, Physical Research Laboratory, Ahmedabad, 380 009, India

Highlights

PM2.5 ionic constituents were measured using AIM-IC over Ahmedabad, India.
Different diurnal trend observed during summer and winter.
RH and secondary formation are more influencing diurnal trend during summer. 
PMF analysis yield four factors for ionic constituents.


Abstract

Water-soluble ionic constituents (Cl, NO3, SO42–, Na+, NH4+, K+, Mg2+ and Ca2+) of PM2.5 were measured using Ambient Ion Monitor coupled-to Ion Chromatography (AIM-IC) with a time resolution of one hour at Ahmedabad (an urban location in a semi-arid region of western India) during summer and winter to study the diurnal and seasonal variations. Maximum abundances of most of the species were observed during afternoon hours in summer, whereas minimum concentrations were found during winter at the same local time. During summer, the concentration levels of most of the constituents in a diurnal cycle are largely influenced by variations in the ambient relative humidity. During winter, the emission strength and boundary layer dynamics impact the diurnal cycle. Secondary inorganic species like NH4+, NO3 and SO42– exhibit significant differences in their relative abundances during winter and summer. Four factors have been derived by Positive Matrix Factorization (PMF) analysis of the water-soluble ionic constituents. These are secondary, sea-salt, mineral dust sources, while the fourth factor is associated with K+, which is likely to be due to emissions related to biomass burning.

Keywords

Aerosol chemistry PM2.5 Secondary aerosol GEOTRACES


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